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https://issues.apache.org/jira/browse/HIVE-15227?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15717574#comment-15717574
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Lefty Leverenz edited comment on HIVE-15227 at 2/16/17 8:40 AM:
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Doc note:  *hive.enable.semijoin.conversion* needs to be documented in the wiki 
for release 2.2.0.

* [Configuration Properties -- Query and DDL Execution | 
https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-QueryandDDLExecution]

Added a TODOC2.2 label.

Edit (16/Feb/17):  HIVE-15894 changes the parameter name from 
*hive.enable.semijoin.conversion* to *hive.optimize.semijoin.conversion*, also 
in release 2.2.0.


was (Author: le...@hortonworks.com):
Doc note:  *hive.enable.semijoin.conversion* needs to be documented in the wiki 
for release 2.2.0.

* [Configuration Properties -- Query and DDL Execution | 
https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-QueryandDDLExecution]

Added a TODOC2.2 label.

> Optimize join + gby into semijoin
> ---------------------------------
>
>                 Key: HIVE-15227
>                 URL: https://issues.apache.org/jira/browse/HIVE-15227
>             Project: Hive
>          Issue Type: Bug
>          Components: Logical Optimizer
>            Reporter: Ashutosh Chauhan
>            Assignee: Ashutosh Chauhan
>              Labels: TODOC2.2
>             Fix For: 2.2.0
>
>         Attachments: HIVE-15227.2.patch, HIVE-15227.3.patch, 
> HIVE-15227.4.patch, HIVE-15227.patch
>
>
> Calcite has a rule which can do this transformation. Lets take advantage of 
> this since Hive has native Left semi join operator.



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